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no bottom or mid after quiet core insert

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I have an o1 yz426 with a powercore 4. I recently installed a quietcore insert. Now i have no bottom end or mid range. After talking to the bike shop they suggested i drop down on the main jet from a 162 to 158.

It still runs the same. Any other advise would be helpful thanks.

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Main only affects WOT. Do not take that shops advice again, they are clueless. But... with the insert, you do need to run a smaller main, so they were correct bt accident.

Move the needle clip closer to the top/flat. Try two positions closer. This will lean the mid range some.

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